9Ni钢超窄间隙光纤激光焊接接头组织及性能
发布时间：2018-07-14 17:54
【摘要】：采用YLS-10000光纤激光器和ERNiMo-8焊丝,对液化天然气船液罐用9Ni钢进行了超窄间隙激光焊接,研究了接头组织和性能。结果表明,优化焊接参数可以得到侧壁熔合良好的超窄间隙接头。焊缝组织主要为奥氏体,两侧结晶形态为柱状晶,中心为等轴晶。热影响区分为明显的粗晶区和细晶区,组织均为马氏体和少量残余奥氏体,硬度均值约为340HV,远高于母材均值(230HV)和焊缝均值(200HV)。拉伸试样均断于焊缝,接头抗拉强度略低于母材的。随着与焊缝中心距离的增大,接头的低温冲击功增大,且均值都在70J以上。断口形貌均为细小的韧窝,接头为韧性断裂。
[Abstract]:Using YLS-10000 fiber laser and ERNiMo-8 welding wire, the ultra-narrow gap laser welding of 9Ni steel for liquefied natural gas tanker was carried out. The microstructure and properties of the joint were studied. The results show that the ultra-narrow gap joint with good side wall fusion can be obtained by optimizing welding parameters. The microstructure of the weld is mainly austenite with columnar crystal on both sides and equiaxed crystal at the center. The thermal effect can be divided into coarse and fine grain regions. The microstructure is martensite and a small amount of retained austenite. The average hardness is about 340 HVV, which is much higher than that of base metal (230 HV) and weld metal (200 HV). The tensile specimens are broken in weld and the tensile strength of the joints is slightly lower than that of the base metal. With the increase of the distance from the weld to the center of the weld, the low temperature impact energy of the joint increases, and the mean value is above 70 J. The fracture morphology is fine dimple and the joint is ductile fracture.
【作者单位】： 上海交通大学上海市激光制造与材料改性重点实验室;高新船舶与深海开发装备协同创新中心;
【基金】：工业和信息化部新型液化天然气船液货围护系统预先研究项目
【分类号】：TG456.7
本文编号：2122493
[Abstract]:Using YLS-10000 fiber laser and ERNiMo-8 welding wire, the ultra-narrow gap laser welding of 9Ni steel for liquefied natural gas tanker was carried out. The microstructure and properties of the joint were studied. The results show that the ultra-narrow gap joint with good side wall fusion can be obtained by optimizing welding parameters. The microstructure of the weld is mainly austenite with columnar crystal on both sides and equiaxed crystal at the center. The thermal effect can be divided into coarse and fine grain regions. The microstructure is martensite and a small amount of retained austenite. The average hardness is about 340 HVV, which is much higher than that of base metal (230 HV) and weld metal (200 HV). The tensile specimens are broken in weld and the tensile strength of the joints is slightly lower than that of the base metal. With the increase of the distance from the weld to the center of the weld, the low temperature impact energy of the joint increases, and the mean value is above 70 J. The fracture morphology is fine dimple and the joint is ductile fracture.
【作者单位】： 上海交通大学上海市激光制造与材料改性重点实验室;高新船舶与深海开发装备协同创新中心;
【基金】：工业和信息化部新型液化天然气船液货围护系统预先研究项目
【分类号】：TG456.7
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